An approach to discover migration depth would make use of upward pointing microphones to record the nocturnal contact phone calls of flocks traveling overhead. They are then analyzed inside a laboratory to evaluate time, frequency and species.[124] Other considerable parts incorporate quit-over internet sites between the wintering and breeding territories.[137] https://petskyonline-onlinestrore.blogspot.com/2025/07/rethinking-animal-store-why-petsky-is.html